Plant growth-promoting bacteria enhance tomato tolerance against tomato spotted wilt virus by unveiling optimal auxin levels.
Werghi S, Hachef A, Chourou MN, Rezgui S, Gharbi D
Soil Health
It points toward a compost-based, chemical-free way to protect your tomato crop from one of the most damaging viruses gardeners face, potentially replacing or reducing the need for pesticides.
Tomato Spotted Wilt Virus is a serious disease that spreads through tiny insects and can devastate tomato plants. Researchers found that mixing certain beneficial bacteria — grown from compost made of old tomato plant scraps — into the soil gave tomato plants a much better chance of surviving the virus. The bacteria seem to work by keeping a natural plant growth signal (auxin) at healthy levels, which the virus normally disrupts to help itself spread.
Key Findings
Three bacterial strains (Bacillus velezensis, Dyella sp., and Bacillus licheniformis) shifted virus-tolerant tomatoes from disease index 2 to index 1, and sensitive tomatoes from index 4 to index 2 — a meaningful improvement in both cases.
Viral load measured by a sensitive gene-detection method (RT-qPCR) confirmed that all three bacteria genuinely reduced virus accumulation in plant tissue, not just symptoms.
All seven candidate bacterial strains were isolated from compost made from tomato crop residues, demonstrating that agricultural waste can be a source of effective, eco-friendly plant protectants.
chevron_right Technical Summary
Certain beneficial soil bacteria — isolated from compost made of tomato scraps — can help tomato plants fight off a destructive virus by restoring a key plant hormone the virus hijacks. Three bacterial strains significantly reduced disease severity in both virus-tolerant and virus-sensitive tomato varieties.
Abstract Preview
Plant Growth-Promoting bacteria (PGPBs) provide a promising eco-friendly approach to enhancing plant resilience against viral infections. This study investigates the role of PGPBs in helping tomato...
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